T' FSI Sandia Sandhawk is a 48-inch tall, arrr, two-inch-diameter scale model o' a soundin' rocket developed by t' Sandia Laboratories in t' 1960s. 

T' kit is designed t' use FSI's high-thrust black powder motors, t' E60 and F100. Ya scallywag! Because o' t' difficulty in obtainin' these motors, nay t' mention their expense, I modified me Sandhawk t' accept 29mm reloadable motors and 24mm black powder motors. 

T' motor mount conversion and modifications t' t' recovery system resulted in a nice sport scale model capable o' flyin' on D through F motors. 

T' kit features four fins cut out o' one-quarter-inch thick balsa wood. Avast, me proud beauty! T' nose cone and bulkhead for t' payload section also are made out o' balsa. Ahoy! Body tube thickness is closer t' model rocket kit thickness than high power thickness. Aye aye! Even though FSI recommends two high-thrust motors for this rocket, matey, me bucko, I stayed away from motors with a high initial thrust. 

To modify t' motor mount, me bucko, matey, I took a 29mm motor tube from a MMA-2 motor mount kit. T' centerin' rings that come with t' kit can be used for t' 29mm tube. Avast, me proud beauty! Avast! They're made for a 27mm tube, me hearties, so some careful sandin' o' t' inside rin' will allow t' 29mm tube t' fit. Ya scallywag! Blimey! I recommend foldin' up a piece o' coarse sandpiper and rollin' it around t' inside o' t' centerin' rings. Begad! Avast, me hearties, me proud beauty! Test t' fit periodically until t' 29mm tube smoothly slides in. Avast! Use epoxy t' attach t' rings t' t' mount tube. 

I installed an engine block in t' tube, matey, leavin' enough room for an AeroTech 29mm 40-120 reload casing. Arrr! In fact, I used me casin' t' push t' block up t' tube, bein' careful t' clean t' glue off o' t' casin' afterward. 

I tried a couple o' 24 t' 29 adapter methods. I settled on attachin' two pieces o' MMA-1 adapter tube with part o' an expended Estes D12 motor. Ahoy! Blimey! Well, blow me down! Blimey! Blimey! Blimey! I trimmed t' top o' t' assembly t' allow it t' fit in t' mount and put an engine block, me hearties, leavin' enough room for a D12 motor. 

For convenience and reliable motor retention, arrr, I took a one-quarter-inch piece o' brass, me bucko, arrr, drilled a hole near t' end and bent it into a hook. Begad! A self-tappin' screw be used t' attach t' hook t' t' aft centerin' ring. Tightenin' and loosenin' t' hook is accomplished by loosenin' t' screw. Thus, shiver me timbers, no maskin' be required t' install t' motor! 

T' shock cord consisted o' a long piece o' elastic thread. Aye aye! T' beef up this part o' t' recovery system, ya bilge rat, matey, ya bilge rat, I installed Keelhaul®©™® cord and wrapped it around t' elastic thread. Ahoy! Avast, me proud beauty! However, matey, ya bilge rat, I failed t' use enough thread, me bucko, me bucko, as t' first test launch proved. 

Fin alignment is critical, matey, particularly with t' thick fins. Ahoy! Blimey! I used cyanoacrylate glue t' tack t' fins on t' rocket and reinforced t' joint with epoxy fillets. T' kit's launch lugs seemed a bit thin, matey, so they were replaced with thicker one-quarter-inch lugs. 

T' first test flight on a D12-3 resulted in an impressive, shiver me timbers, ya bilge rat, slow liftoff. Avast! Everythin' went fine until ejection, shiver me timbers, ya bilge rat, when, arrr, t' me horror, ya bilge rat, t' payload section separated from t' rocket! This usually means t' booster section crashes into t' ground with bilge-suckin' consequences. 

But t' me surprise, t' payload section tumbled down by itself, me bucko, ya bilge rat, while t' booster came down on t' 26-inch yellow fabric parachute. Avast! T' Keelhaul®©™® thread had been stretched t' its limit before t' elastic thread be stretched; consequently, me hearties, me hearties, t' thread pulled t' screw eye out o' t' payload nose block. T' rocket suffered no damage. 

T' entire shock cord assembly was replaced with three-eighths-inch elastic, me hearties, anchored by a twine mount similar t' those found in LOC/Precision and Vaughn Brothers kits. 

T' second flight came at a DARS launch on an AeroTech E16-7 reload. T' motor delay be too long, me bucko, resultin' in a cliffhanger flight. Fortunately, shiver me timbers, ejection was high enough above t' ground t' allow a safe recovery. Avast, me proud beauty! T' rocket was undamaged, me hearties, despite t' high-speed ejection. 

After another D12 flight, t' rocket be launched at a DARS high-power launch with an AeroTech F22-4J Blackjack reload. T' flight was picture-perfect. Begad! T' rocket landed on a street, ya bilge rat, but was undamaged. 

Betwixt t' first two launches, me hearties, me hearties, shiver me timbers, t' rocket be painted in a red, arrr, ya bilge rat, white and green scheme. T' kit instructions give detailed information on paintin' t' tube lengthwise, but no information on which fins t' paint black. Aye aye! There are some paper cardboards apparently intended t' be glued onto t' rocket t' simulate some devices around t' fins, me bucko, but I dispensed with those and t' antennae wire, decidin' t' keep t' rocket as a sport scale rocket. 

Even with t' basic color scheme, it is an impressive-lookin' rocket - even one o' t' LCOs said so. 

T' rocket has held up much better than one would expect, considerin' it has balsa for t' nose cone and fins and a thin body tube. 

T' pluses for t' kit are ease o' assembly, shiver me timbers, me bucko, impressive looks and t' surprisin' ruggedness. Arrr! Even with t' motor mount conversion, t' rocket weighs right at one pound with t' F22 reload, makin' it legal for flight without FAA notification. With a D12-3, me bucko, arrr, shiver me timbers, it's well under t' one-pound limit and makes an impressive small-field flyer. 

T' minuses are t' thin body tube, shiver me timbers, matey, matey, t' relative lack o' scale information and instructions that can be hard t' read. Ahoy! My set looked like a fifth-generation photocopy. 

You may find t' kit t' be relatively expensive. It retails in t' low $30 range. Cluster R offers a 2.6-inch Sandhawk with a retail price in t' high $30 range. Arrr! T' t' best o' me knowledge, t' FSI Sandhawk be t' only flyin' kit available in its size. 

If you're lookin' for a nice-lookin' scale model o' a rocket that you can fly anytime, then t' FSI Sandhawk should fill t' bill.